First lady Michelle Obama was gunning for political money in Boston on Wednesday, but it was her own "guns" and fitness routine that muscled their way into the fundraising event for Massachusetts Senate candidate Rep. Ed Markey.

Sen. Elizabeth Warren kicked off the event by cheering the first lady's famously toned arms. "I love Michelle Obama. She's a real fighter. Just take a look at those biceps," she said.

Markey, in a tight race with Republican Gabriel Gomez, praised Obama's anti-obesity campaign for kids.

"Mrs. Obama is first and foremost to committed to the children of our country," Markey said. "She wants to make sure that these children are healthy, that they are educated, that they are safe."

Then he added, "In my campaign, we could use some of those eating and exercise lessons on the campaign trail."

The event raised about $600,000 from 280 people who paid $500 to $37,600. The first lady and President Obama have been on a fundraising frenzy for congressional Democrats in hopes of winning control of the House and expanding control of the Senate to advance his second-term agenda.